Modding is basically adding components to the game for realism, measuring tools, sound, boat physics, GUI, strategy, multiplayer, and the list goes on.
First thing you need to ask yourself is, what kind of mods are you looking for?
What kind of sub simmer are you?
You have to ask these questions, because you can't have all the mods, and some mods actually conflict with other mods and cause some serious game crashes.
If you like vanilla, there are little single mods to add tools to your nag map, while super mods will completely change the way your game is played.
You need to experiment. Start with a single small mod from the download section, and work your way up!
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